Compound spring friction-gear.



1.1. HVEEM.

COMPDUND SPRING FsCTloN GEAR.

APPLICATION FILED FEB. 26. 1917.

./VEY.

IN1/EN TOR. l/incl Queen Pateutd 00. 29, HHS;

2 bPEETb- BHELT /MWMN l m i an inspection of Fig. 1, that the inner ends ends of the posts 30. The function of this of the followers J are normally s aced from the adj acent ends of the main or eavy coils C, which distance is less than the distance between the followers J- and the adjacent s acing will appear from the description of t e operation about to follow.

theV front Upon linward movement of thc draw bar,

"wardly,' moving the follower J therewith.

This movement will be' resisted at first by the 'front preliminary spring D until the `front follower J engages the front heavy sprino' C; Thereafter, both front springs C and wlll be compressed simultaneously until the front follower J engages the forwardly extended post 30 from the wedge.

, Upon continued inward movement of the 4draw bar and associated parts, it is apparent that the front main spring D will continue to be compressed and the wedge will then be moved rearwardly, thus actuatin Athe friction shoes with respect to the shell the rear inner light coil l).

"of the pressure from the This movement of the friction shoes is resisted by the rear heav coil C through the rear follower' H. In a ditin to th' frictional resistance thus produced an the spring resistance of the front heavy coil C which is cumulative therewith, there will be provided the additional spring resistance of pon removal draw bar, it is apparent that the release of the parts will be effected by the rear light spring D acting directly on the wedge and the rear heavy coil C acting en the friction shoes. The full buff position of the parts is shown in Fig. 5. The foregoing operation under buil is similar to the operation under drafif'ei:- cept that the rear follower J' will be moved inwardly with corresponding changes in the sequence of operations of the springs and friction elements. v

From the preceding description, it will be seen that the improved friction gear provides a graduated action wherein the first resistance is provided by a light'coil for a predetermined distance,'then the resistance is increased by the addition of a heavy straight spring resistanceI for another pre determined distance, after' which the spring resistances have a'dded thereto the resistance of the friction elements. rllhe gear thus providesnot only an easy graduated action but an ultimate high capacity wherein friction and spring resista-nece are employed cumulatively.

I claim, l l. In a friction shock' absorbing mechfollower l5 will be forced inA of the shoes,

anism, the combination with s; friction shell and friction elements. coperable therewith, of a main spring and a preliminary sprin disposed at each end of the frictionshel and an end spring follower coperable with each of the said preliminary springs, said end followers 'having each a preliminary spring movement for a predetermined distance resisted by the corresponding adja-` cent preliminary spring, each of said end followers having a further movement after the-said preliminary movement and resisted by the combined action of the friction Aelements and all of the springs.

2. In a friction gear, the combination with a centrally disposed friction shell and friction elements including a wedge coperable therewith, of a heavy main spring at cach end of the friction shell coperable with the friction elements, and a preliminary spring at each end of the gear, one of said latter being actuated a predetermined distance prior to the actuation of the friction elements.

3. In a friction gear, the combination with a stationary friction shell, friction shoes mounted therewithin, and a doubleacting wedge coperable with said shoes, of

a heavy spring disposed at either end of thev friction shoes and co-act'mg therewith,

spring followers at each end of the gear,l

and a preliminary spring interposed between each of said spring followers and the double-acting wedge.

4. As an article of manufacture, a combined friction shell and spring casing comprising, a. friction shell proper, a spring casing at each end thereof, the spring casings having shouldered engagement with, the frictionshell, and means for rigidly-uniting the shell'and casi-nge. Y

5. In a friction gear, the. combination with a stationary friction shell, friction slices coperable therewith, and a doubleacting wedge co-acting with the shoes, said wedge having post extensions from each end thereof, of followers at each end of the gear and normally spaced from said posts, a heavy spring at each end of the friction shell and co-acting with the friction shoes, said followers being also normally spaced from said heavy springs, and a preliminary sp1- ing coperable with each of said followers.

(3. In a friction gear, the combination with a friction shell, friction shoes coperable therewith, and a double-acting wedge mounted within the shoes, of a heavy spring each end of the friction elements,

the heavy springs being adapted to resist movement followers at the ends of the gear, the followers being engaged by the light springs and normally spacedfrom-the heavy springs.

In s. friction gear, the combination with a centrally disposed stationary friction shell, friction shoes coperable -withsaid "shell, and a double-acting wedge disposed -within the shoes= of :if spring casing disl posed nt each end of the friction shell,4 each 1` casing being internally shouldered near its Wouter end, a main heavy spring disposed within each csing and'A seated at its outer L 'endgainst the shoulder of the correspond- ,ngs'ing andleans and actuatingthe wedge from either v@n ,4

A "8. 'In fa" friction gear,

the combination forcompressing said In witness that I have hereunto ,Subscribed my na'me this 16th friction shoesA cog" g 'dayof Feb-,1917.

r/able therewi'tl'iya WedgeLCO-'aetng with. t e' shoes, the .wedge being operable in either -v 4direction end having posts extending from near its' outer end, a main'spring seated Within each casing and engaging at lts outer end the corresponding shoulder of the spring casing and at its inner end co-acting with the friction shoes, a follower telescoped with each spring casing t its outer end, and a preliminary spring disposed Within each casing and extending between the corresponding follower 'and the` Wedge.

claim the foi egoing I JOHN J. HVEEM.' 

